Stereoindex Amplifier Favorites for Different Hi-Fi Systems

This entry is unusual in an amplifier guide because the article is primarily about Dum Audio’s vinyl source, The Turntable.

Its relevance here is the wider Dum Audio mono-brand system, which includes The Amplifier, a transistor integrated amplifier with a Bluetooth adapter.

The source describes Dum Audio’s concept as inexpensive hi-fi equipment with only the necessary functionality, and The Turntable itself follows that idea with a belt drive, an Ortofon 2M Red moving-magnet cartridge, a switchable MM phono stage, anti-vibration feet, and a dust cover. Treat this less as a standalone amplifier recommendation and more as a pointer to a simple matched system built around vinyl and a dedicated integrated amplifier.

The Boulder 1162 is a serious stereo power amplifier aimed at systems that need dedicated two-channel power rather than an integrated solution.

The source specifies 300 watts per channel into eight ohms and places it within Boulder’s 1100 series alongside a mono power amplifier, phono amplifier, and preamplifier.

Its engineering brief emphasizes refined circuitry, optimized mechanical construction, Class A bias circuitry, dual power transformers with DC filtering, and newly developed protection circuitry that can shut the output stage down quickly in the event of speaker-cable shorts or system faults. Four pairs of high-current speaker terminals also make it convenient for bi-wiring compatible loudspeakers.

The Luxman C-900u is not a power amplifier but a high-end preamplifier intended to control and feed a separate power amplifier.

The supplied material highlights a fully balanced discrete circuit topology, four balanced amplification modules for channel separation and noise reduction, and Luxman’s ODNF feedback loop in version 4.0.

Volume control is handled by an improved LECUA 1000 attenuator with 88-step adjustment, while durability and signal integrity are addressed through gold-coated board conductors, selected resistors and capacitors, copper-alloy RCA connectors, a substantial power supply, and a vibration-resistant chassis weighing almost 20 kg. It suits systems where fine control, balanced architecture, and preamplifier quality matter as much as output power.

The Onkyo PA-MC5501 is built for multichannel systems that need outboard amplification across nine channels.

The article describes a design intended to provide dynamic response, transparency, and clarity, with Onkyo’s push-pull amplification circuit and WRAT technology used to minimize noise and distortion, stabilize voltage, and increase current delivery.

It is THX Ultra 2 certified, rated up to 220 watts per channel into 6 ohms, and uses discrete transistor output stages in a three-stage inverted Darlington circuit. The power supply includes a massive toroidal transformer and two custom 22,000 μF filter capacitors, while the metal case uses an anti-resonance chassis and separate anti-vibration panels.

The McIntosh MC301 is a monoblock power amplifier rated at 300 watts, designed for systems where each speaker channel receives its own dedicated amplifier.

The source describes it as the smallest power amplifier in the McIntosh range covered by the article, while retaining the brand’s visual cues: black glass front panel, fiber-optic backlighting, aluminum side inserts, and a blue-backlit wattmeter.

Technically, it uses fully balanced Quad Balanced topology with two matched amplifiers feeding an output autotransformer with taps for the relevant speaker load. The article also notes Power Guard overload protection, very low harmonic distortion of 0.005%, and an ability to cope with low-impedance speaker systems.

The Cambridge Audio Edge W is a stereo power amplifier designed around a short signal path and a fully symmetrical circuit layout.

The article states that it operates in class AB while transitioning to linear A at lower levels, and that its signal path contains only 14 components.

Power is specified at 100 watts RMS into 8 ohms and 200 watts into 4 ohms. The power supply uses two toroidal transformers arranged in a distinctive symmetrical configuration to reduce electromagnetic interference and provide reserve. XLR and RCA inputs are joined by outputs, allowing multiple Edge W units to be used for bi-amping or tri-amping configurations.

The supplied article focuses on the T+A PA R, an integrated amplifier with a broad control set and system-friendly connectivity.

It has a low-profile enclosure, a front-panel display, a dynamic VU meter, bass and treble controls, switchable loudness, stereo balance adjustment, and the option to disable signal processing for the most linear operation.

Inputs include balanced and line-level connections, with selected XLR and RCA inputs configurable for home-theater use with a surround processor. The article also notes a front headphone jack, Pre Out, R2-Link system bus connectors, LAN for control and monitoring, and two pairs of bare copper binding posts.

The Fosi Audio MC351 is a compact integrated DAC amplifier aimed at users who need many inputs and a 2.1-channel configuration in a small package.

The source lists Bluetooth, USB, optical, and coaxial digital inputs, high-resolution decoding support, and output capability described as up to 165 watts x 2 plus 350 watts in a 2.1 setup.

It uses two Texas Instruments TPA3255 Class D amplifier chips and a 100-fin heatsink, with a dual-layer PCBA layout intended to reduce interference between input and output signals. Practical touches include one-click switching between five input modes, bass and treble controls, auto standby after two minutes without signal, a solid aluminum-alloy body, and a small round VU meter.

The Yamaha RX-A2A is an AV amplifier for home-theater systems rather than a pure two-channel hi-fi amplifier.

The article describes it as an Aventage model with 7.2 channels, 125 watts with one channel driven into 8 ohms, 17 DSP systems, Dolby Atmos with Height Virtualizer, DTS:X, a Burr-Brown DAC, MusicCast, AirPlay 2, Bluetooth, and YPAO automatic room correction.

It also lists seven HDMI inputs and one output, 4K upscaling, class AB amplifiers, trigger and remote input, and compatibility with MusicCast wireless surround speakers. Its chassis uses improved damping with a fifth leg, and its styling differs from the RX-V6A with a more rectangular, solid-looking front.

The Fosi Audio BT20A is a compact Class D stereo amplifier built for simple systems where RCA and Bluetooth are enough.

The source describes it as using two Texas Instruments TPA3116D2 amplifier chips, with power specified as 2 x 90 watts into 4 ohms at 24 V and 1% THD, or 2 x 50 watts into 8 ohms under the same supply and distortion conditions.

Inputs are stereo RCA and Bluetooth 5.0, while outputs are speaker terminals. Front-panel bass and treble controls allow basic tonal adjustment, and the listed specifications include 20 Hz to 50 kHz frequency response, signal-to-noise ratio of at least 98 dB, compact dimensions, and a 700 g net weight.